Dos, try to keep your listed URLs "consistent"; like Pinyo already mentionned, it isn't good to have mixed results from both indexed hosts,
http://www.YourDomain.com and http://YourDomain.com !
Insert following file in your .htaccess and you will get rid of possible upcoming problems.
RewriteEngine On
RewriteCond %{HTTP_HOST} !^www\.YourDomain\.com$ [NC]
RewriteRule ^(.*)$ http://www.YourDomain.com$1 [R=301,L]